This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A208178 #25 Nov 01 2022 12:22:24 %S A208178 257,769,3329,7681,7937,9473,10753,11777,12289,13313,14081,14593, %T A208178 15361,17921,18433,19457,22273,23041,23297,25601,26113,26881,30977, %U A208178 31489,32257,36097,36353,37633,37889,39937,40193,40961,41729,43777,45569,46337,49409,49921 %N A208178 Primes of the form 256*k + 1. %C A208178 Odd primes p such that -1 is a 128th power mod p. - _Eric M. Schmidt_, Mar 27 2014 %H A208178 Reinhard Zumkeller, <a href="/A208178/b208178.txt">Table of n, a(n) for n = 1..10000</a> %F A208178 a(n) ~ 128n log n. - _Charles R Greathouse IV_, Nov 01 2022 %t A208178 Select[256 Range[195] + 1, PrimeQ] %o A208178 (PARI) for(n=1,195,r=256*n+1; if(isprime(r), print1(r", "))); %o A208178 (Magma) [ p: p in PrimesUpTo(50000) | p mod 256 eq 1 ]; %o A208178 (Haskell) %o A208178 a208178 n = a208178_list !! (n-1) %o A208178 a208178_list = filter ((== 1) . a010051) [1,257..] %o A208178 -- _Reinhard Zumkeller_, Mar 06 2012 %Y A208178 Cf. A065091, A002144, A007519, A094407, A133870, A142925, A208177, A076339. %K A208178 nonn,easy %O A208178 1,1 %A A208178 _Bruno Berselli_, Feb 25 2012